Mattress Topper Directly on The Floor

I'm thinking about temporarily sleeping on a mattress topper only, on a carpeted floor, until I find a bed base and mattress that will suit my needs and wallet. Unless I like it and keep it that way.

Has anyone done that and what kind of topper have you used, and what's been your experience? For reference, I'm 62 kg and 1.8m.

Some considerations:
- I'm thinking I'd need to lift the topper by day to aerate the underside, otherwise it'll be humid there and mouldy. Anyone to confirm that it's a real issue?
- There are a few types and thicknesses, it looks like 7cm high density foam should provide the best isolation from the floor (any feedback about that), but there are fancy things like gel-infused memory foam of which I have a hard time understanding the mechanical properties.